[INFO] cloning repository https://github.com/MFJWR/iron_example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MFJWR/iron_example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMFJWR%2Firon_example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMFJWR%2Firon_example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3b06d9a11ce3b5a182b59fc6f2ac73389dbcdda7
[INFO] checking MFJWR/iron_example against master#31ee872db5aae4750e3da1ca4ed1523c4356947f for pr-78461
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMFJWR%2Firon_example" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MFJWR/iron_example on toolchain 31ee872db5aae4750e3da1ca4ed1523c4356947f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MFJWR/iron_example
[INFO] finished tweaking git repo https://github.com/MFJWR/iron_example
[INFO] tweaked toml for git repo https://github.com/MFJWR/iron_example written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/MFJWR/iron_example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3b4464a381505030eaef180d1a95b2ad9f7589776ad0f869821be2561f83c50b
[INFO] running `Command { std: "docker" "start" "-a" "3b4464a381505030eaef180d1a95b2ad9f7589776ad0f869821be2561f83c50b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b4464a381505030eaef180d1a95b2ad9f7589776ad0f869821be2561f83c50b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b4464a381505030eaef180d1a95b2ad9f7589776ad0f869821be2561f83c50b", kill_on_drop: false }`
[INFO] [stdout] 3b4464a381505030eaef180d1a95b2ad9f7589776ad0f869821be2561f83c50b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+31ee872db5aae4750e3da1ca4ed1523c4356947f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85590bb716d0fa48a381298ec94d3c826c93ff729ab42e20946394487fa86a52
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "85590bb716d0fa48a381298ec94d3c826c93ff729ab42e20946394487fa86a52", kill_on_drop: false }`
[INFO] [stderr]     Checking route-recognizer v0.1.12
[INFO] [stderr]     Checking log v0.4.0
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]     Checking url v1.6.0
[INFO] [stderr]    Compiling mime_guess v1.8.3
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr] error: failed to run custom build command for `mime_guess v1.8.3`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/mime_guess-f73ecd89dc7e3513/build-script-gen_mime_types` (exit code: 101)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 30, kind: Other, message: "Read-only file system" }', /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mime_guess-1.8.3/src/gen_mime_types.rs:22:67
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x564cc1b2f130 - std::backtrace_rs::backtrace::libunwind::trace::h448c56741b6011d3
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5
[INFO] [stderr]      1:     0x564cc1b2f130 - std::backtrace_rs::backtrace::trace_unsynchronized::h881b9d30a8a89a0c
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stderr]      2:     0x564cc1b2f130 - std::sys_common::backtrace::_print_fmt::h720a2f61f75b9f58
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stderr]      3:     0x564cc1b2f130 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8d62bbfda6d5c836
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:46:22
[INFO] [stderr]      4:     0x564cc1b4836c - core::fmt::write::h1857a60b204f1b6a
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/fmt/mod.rs:1078:17
[INFO] [stderr]      5:     0x564cc1b2d632 - std::io::Write::write_fmt::h16a9fe7680ac245c
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/io/mod.rs:1518:15
[INFO] [stderr]      6:     0x564cc1b31295 - std::sys_common::backtrace::_print::h9ba51a6db618de7d
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:49:5
[INFO] [stderr]      7:     0x564cc1b31295 - std::sys_common::backtrace::print::h5f20e41c85e91716
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:36:9
[INFO] [stderr]      8:     0x564cc1b31295 - std::panicking::default_hook::{{closure}}::h8d48653392f3b04c
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:208:50
[INFO] [stderr]      9:     0x564cc1b30f38 - std::panicking::default_hook::hb3948d1f74b6ff4c
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:227:9
[INFO] [stderr]     10:     0x564cc1b319d1 - std::panicking::rust_panic_with_hook::h55d23fef0ad751bc
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:593:17
[INFO] [stderr]     11:     0x564cc1b31517 - std::panicking::begin_panic_handler::{{closure}}::h56ae74c6dea6e141
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:499:13
[INFO] [stderr]     12:     0x564cc1b2f5cc - std::sys_common::backtrace::__rust_end_short_backtrace::h3c4721f56689fae4
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:141:18
[INFO] [stderr]     13:     0x564cc1b31479 - rust_begin_unwind
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:495:5
[INFO] [stderr]     14:     0x564cc1b47711 - core::panicking::panic_fmt::hb15d6f55e8472f62
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/panicking.rs:92:14
[INFO] [stderr]     15:     0x564cc1b47533 - core::option::expect_none_failed::he492a18657d97593
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/option.rs:1268:5
[INFO] [stderr]     16:     0x564cc1af94db - core::result::Result<T,E>::unwrap::h824879b7e5b41e61
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/result.rs:973:23
[INFO] [stderr]     17:     0x564cc1aea4b1 - build_script_gen_mime_types::main::h471321081ba14172
[INFO] [stderr]                                  at /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mime_guess-1.8.3/src/gen_mime_types.rs:22:38
[INFO] [stderr]     18:     0x564cc1aebd1b - core::ops::function::FnOnce::call_once::h5d5fd0755753764d
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/ops/function.rs:227:5
[INFO] [stderr]     19:     0x564cc1b0a24e - std::sys_common::backtrace::__rust_begin_short_backtrace::h606d484123c3a242
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/sys_common/backtrace.rs:125:18
[INFO] [stderr]     20:     0x564cc1aebb51 - std::rt::lang_start::{{closure}}::heccb2a915f13bb32
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/rt.rs:66:18
[INFO] [stderr]     21:     0x564cc1b31df7 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h3f3ba5d1e0ce8d49
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/core/src/ops/function.rs:259:13
[INFO] [stderr]     22:     0x564cc1b31df7 - std::panicking::try::do_call::hd7a374fc87b951e7
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:381:40
[INFO] [stderr]     23:     0x564cc1b31df7 - std::panicking::try::h068087b173f80a49
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panicking.rs:345:19
[INFO] [stderr]     24:     0x564cc1b31df7 - std::panic::catch_unwind::h1f8259807e825279
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/panic.rs:382:14
[INFO] [stderr]     25:     0x564cc1b31df7 - std::rt::lang_start_internal::h8ff82302dd620b52
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/rt.rs:51:25
[INFO] [stderr]     26:     0x564cc1aebb27 - std::rt::lang_start::hd39384a20ddc501b
[INFO] [stderr]                                  at /rustc/31ee872db5aae4750e3da1ca4ed1523c4356947f/library/std/src/rt.rs:65:5
[INFO] [stderr]     27:     0x564cc1aebada - main
[INFO] [stderr]     28:     0x7f345f9af0b3 - __libc_start_main
[INFO] [stderr]     29:     0x564cc1ad90ae - _start
[INFO] [stderr]     30:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0713]: borrow may still be in use when destructor runs
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/url-1.6.0/src/form_urlencoded.rs:261:40
[INFO] [stdout]     |
[INFO] [stdout] 259 | impl<'a> Target for ::UrlQuery<'a> {
[INFO] [stdout]     |      -- lifetime `'a` defined here
[INFO] [stdout] 260 |     fn as_mut_string(&mut self) -> &mut String { &mut self.url.serialization }
[INFO] [stdout] 261 |     fn finish(self) -> &'a mut ::Url { self.url }
[INFO] [stdout]     |                                        ^^^^^^^^ - here, drop of `self` needs exclusive access to `*self.url`, because the type `UrlQuery<'_>` implements the `Drop` trait
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        returning this value requires that `*self.url` is borrowed for `'a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0713`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "85590bb716d0fa48a381298ec94d3c826c93ff729ab42e20946394487fa86a52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85590bb716d0fa48a381298ec94d3c826c93ff729ab42e20946394487fa86a52", kill_on_drop: false }`
[INFO] [stdout] 85590bb716d0fa48a381298ec94d3c826c93ff729ab42e20946394487fa86a52